Questions tagged [high-current]
Say how much current is required, high-current means different things to different people.
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0answers
91 views
Safe Voltage/Amperage for Soldered Wires - aka When to Crimp Instead
I have found a lot of information that circles around what I'm looking for, but nothing that directly answers it. It is possible there is no right answer.
I am jealous of the Macbook ...
-6
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2answers
103 views
Which resistors to use for high current (10A) voltage-divider? [closed]
I'm having a problem determining resistor specs (especially wattage) for my voltage divider circuit [ 27 V to 17.5 \$+-\$ 0.5 V ] on 10 ampere DC supply.
I have an AC (220V 50Hz) to DC (27V 10A) ...
0
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1answer
68 views
How to safely limit current for DC12v 30a?
I am plating my vias with electrolysis, and I need to safely limit the current so it doesn't go over 30 amps.
The power supply I'm going to order is, you guessed it, 12V 30A.
I've calculated the ...
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2answers
46 views
Multiplexing high current connections?
Noob question here.
Currently I'm using a darlington transistor array to drive about 14 IR leds. I want to be use a CD74HC4067 multiplexer to simplify and shrink things up a bit. The IR led's I'm ...
2
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0answers
41 views
Suggestions solutions for high current bed of nails style testing [closed]
I'm trying to create a tester board that will hold some power path components (DC input caps, IGBTs, current sensors) that are normally on the Unit Under Test (UUT).
I'd like to connect these ...
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2answers
40 views
Sizing cables in pulsed power applications
I am looking for rules for sizing cables for short pulses. For example, if I were to run 2000A DC current for 0.5 seconds in a cable, what size would I need? Sizing as if it were continuous current ...
1
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1answer
80 views
High voltage and current
I have a DC motor that needs and works nearly 400v and 20A. I chose FDL100N50 for n-channel mosfet also IXTK40P50P for p-channel mosfet.
I connect a 4n35 optocupler for output of every mosfet.
Are ...
1
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2answers
103 views
Joining high current wires outdoors
I am conducting an experiment where I would like to heat up 18 AWG copper cables outdoors using to 50-60°C using 60 amps. The wires are wrapped with teflon to prevent damage to the cable. Can I use a ...
7
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1answer
697 views
Series pass transistor, LM7812
I am making a 12 volt regulator for a solar panel to power an audio amplifier. I already have a switching regulator for most application but it is very noisy for amplifier even with a lot of filtering....
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0answers
30 views
Shorting the output of both the channels of L298N
Suppose I started with a project requiring the control of motors and ended with using L298N in my project, realizing that my motor only takes around 1.5A when on load.
Now, with time I realized that ...
2
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1answer
124 views
High current, low voltage capacitors
I'm putting together a high current (200A+), low voltage (<5v) rectifier circuit.
I have sufficient bridge rectifiers, but to smooth out the waveform I need a strong enough capacitor bank. Besides ...
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1answer
91 views
Stabilize circuit on 5V 2A
I have not yet build following circuit:
Circuit in high performance needs 5V 1.7A (measured). I have source which is powerbank with 16 000 mAh. Outputting via ports: USB-C 5V/3A, USB-A 5V/3A, Micro-...
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1answer
128 views
Sizing a trace on a PCB to carry 50 amps
Currently working on a 4 layer pcb-card where I need to trace for 50 amps, any ideas how I can design it?
Any tips would be appreciated. Thanks!
1
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0answers
60 views
Electric heating for glass melting furnace
Some furnaces use electricity for glass melting. Low voltage and high amperage power is passed through the molten glass through 2 molybednum electrodes dipped into the glass. The molten glass acts as ...
2
votes
1answer
142 views
How to generate a high energy electromagnetic wave? Using high voltage or high current?
I am about generating an electromagnetic wave which should be powerful enough. So I should manipulate its electric field and magnetic field simultaneously. As far as I know E amplitude depends on the ...
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0answers
100 views
How to line a Metal Melter secondary for higher safety
A Metal Melter is a kind of home-made low voltage (less than 40 volts, mine is 3v) welder (small-scale) made from a microwave oven transformer (MOT). I left the primary intact (the thicker wire, which ...
1
vote
1answer
104 views
Switching high voltages with MOSFET at high frequencies
I need to rectify 220V 50Hz AC power to obtain 48V DC output voltage. Up to 40A current can be drawn from the DC side. 10% ripple is acceptable on the rectified voltage.
I am considering two ...
0
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1answer
47 views
How to control a lightbar with 20 individual modules? [closed]
The TL;DR version of my question is, how do you control 20 pieces of 12V/1A outputs in the most reliable, compact and cost efficient way, with something programmable?
The long version:
I got a ...
0
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4answers
212 views
Too High Voltage Drop across Transformer's Output
I want to get very high current flow thought secondary winding of transformer on my 3 Ohm load. As I apply high voltage of secondary to the load the voltage across it drops dramatically. Only about 2% ...
10
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7answers
2k views
How can the ACS712 pin handle 20 A?
I am searching for some current measuring ICs and found the ACS712, but what I can't figure out is how the seemingly small pins can handle the 20 A current since the trace width calculators say that I ...
0
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0answers
73 views
4 Layer board with high current return path inner layer
So I am doing a layout for a 4 layer PCB 1 ounce/layer. The Chip supports up to 20A (motor controller driver). The application needs about 12 amps max ( I plan it let it go up to 17A in the event of ...
0
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1answer
76 views
Specifying parts for Induction Heater; how to determine current requirements at transformer? [closed]
I'm working on specifying parts for the following circuit:
I intend to have a very large work coil, (like 12" diameter) so I'm expecting to need a lot of power. I'm on a tight budget, though, so ...
1
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2answers
188 views
IGBT destroyed. Help me identify any potential problems
I am trying to build an inductive oven control (for temperatures up to 1500 C), that controls the temperature by turning on the the inductive oven on and off like a commercial inductive hotplate.
...
1
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0answers
391 views
Pulsed DC, kA range inductive transient protection method
I would like to design a transient protection solution for HVDC_pulse_unit.
HVDC voltage = 3500V , current > 40kA.
Events:
D1 flyback diode survives(50kA surge forward current).
MOVs section did ...
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2answers
88 views
Can power transformers be used with higher voltages?
I purchased a Japanese transformer for a project I’m doing. It runs on 100VAC, not 120V, something I overlooked. Doing a quick search, Japan seems to use both 50/60Hz, based on the region.
It’s 30 ...
2
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2answers
67 views
Will a 300A HV connector fail before a 600A fuse does?
I know this is a silly question but I cannot find ant data indicated it will not. The HV connector rated at 300A @ 85C and it is a 600A fuse, I cannot find a connector with a higher current rating.
...
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1answer
59 views
MOSFET-switching between two power supplys: how to avoid transverse current?
For a hobby project I would like to switch between two power supplys.
The two power supplys are two 6s LiPo batteries. If one battery is empty i want to immediatelly switch to the other battery. (the ...
1
vote
2answers
110 views
Electrical Heater Confusion
I know that a semiconductor material, that is usually used for heaters in variety of application, heat up due to high current, which flows through them or high power dissipation across them.
But lets ...
0
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1answer
80 views
Looking for resources for determining cable requirements for high wattage (MW) applications
I'm doing some personal research on the specifications for cables that can handle megawatt power draws. As an example, the wires needed to supply 450VAC @ 2000A (0.9MW). I'm looking for wire diameters ...
0
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2answers
219 views
How to limit HV capacitor charging current?
I have a voltage doubler, which is connected to mains (without galvanic isolation):
It enticed me with its simplicity, configurability and option between charging speed or desulfatability.
The ...
6
votes
1answer
232 views
Switch high voltage with triggered spark gap
I want to switch a high current/voltage pulse (up to few 10kV, <1kA) from a capacitor as supply. It needs to be cheap and I don't care about efficiency too much yet.
I took a look at using ...
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0answers
288 views
Soldering sheet busbars to PCB concerns
Hello fellow engineers
I have decided to solder busbars to a high current pcb , but i have 2 concerns :
Does soldering a flat busbar (shown in left image) could cause thermal stress and deformation ...
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2answers
117 views
High current/high voltage/high frequency measurement
I have a circuit that I'm having trouble understanding. It measures the current flowing through a conductor. The measured load is 20-100 Amps, 9kHz-34kHz, and approx. 340 volts. The main conductor ...
1
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3answers
142 views
Why Does Flyback Current Destroy Darlington Buffered Op-Amp?
I am working on a project where I'd like to deliver variable DC control voltages to a continuous solenoid motor in order to achieve different velocities of actuation.
To buffer my DC control voltage ...
2
votes
2answers
374 views
16A Relay controlled with PWM
I am not very experienced with relays but I need to control the state of a relay with a PWM signal such that if the microcontroller is damaged and the controlling pin gets stuck in a high or low state ...
2
votes
0answers
357 views
TDA7294 100W Audio Amplifier Causing Unexpected Problems
This is the circuit I will be referring in this question:
TDA7294 is described in this data sheet. Upper IC with added external components is a well-known circuit and can be found on many websites ...
1
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0answers
146 views
Turn ON/OFF 5V 2-5A by Raspberry Pi GPIO
I need to control few 5V 2-5A devices by rpi GPIOs, which has the 3.3V logic level. I come up with a simple circuit, but I'll appreciate any ideas, corrections, suggestions. The LOAD is something like ...
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4answers
93 views
Can I provide a constant charge to a battery?
I have a sketch here of what seems like a solid plan. sketch
I need to provide a .2ohm coil around 3.7v which will take around 20 amps. The load will be very brief; 3-5 seconds, and intermittent; ...
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5answers
610 views
Best way to solder to a relay pin requiring ~30A of current?
On our hot tub circuit board, a trace on the PCB finally got cooked... Quite little damage, actually. The one trace is blackened, and the PCB now has a hole in it, but otherwise, everything looks ...
0
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1answer
86 views
Digital switch for 2000V capacitor [closed]
I want to produce a discharge of a capacitor against a test cell, as part of a study on high energy states of materials.
I'm using a standard microwave oven transformer as the power supply that I ...
0
votes
3answers
111 views
Protect power supply from regenerative drive
I am running a 3KW motor on a big 24Vdc power supply (Meanwell RST-5000), through a frequency drive.
When stopping the motor, however, I occasionally get a regenerative backcurrent that trips the ...
0
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2answers
168 views
Transimpedance Amplifier (TIA) - How to shunt high current spikes?
I am working on the design of a high-bandwidth transimpedance amplifier (TIA) to detect a relatively weak optical signal (100μW) but also be able to withstand short pulse, high power optical signals (>...
0
votes
1answer
89 views
Mosfet blows on high load using gate driver
I am using LM5060 from TI for switching big modular N channel MOSFET in SOT-227 package (IXFN420N10T) for relative high 100-200A loads.
On small loads like 10-20A it was working fine then we tried a ...
0
votes
2answers
106 views
Seeking recommendation for capacitor to handle high pulse current
I'm seeking recommendations for an inexpensive capacitor that will handle fairly-large pulse currents. Maximum voltage is 15 Vdc applied to the capacitor and I'd like to see current pulses in the ...
0
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3answers
617 views
Can I get a 150V DC output LM317HV-MIL
Can I get a 150V DC output from the circuit below by using LM317HV-MIL? As the voltage input I will be using a 160V unregulated input voltage from a rectifier.
If so, is there anything that I have ...
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2answers
225 views
16Amp plug to 6Amp plug [closed]
I have 6Amp socket all around my home, but my washing machine has 16Amp plug.
Can convertor be used to plug 16 Amp in 6 amp socket somehow?
I am in India, so electricity is 240v50Hz
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votes
2answers
144 views
High current in Coil/Inductor
I'm trying to build a 5V 8A buck converter and I chose the XL4016E1 IC for this operation (datasheet). There it says I need a 47uH 12A coil. Unfortunately i couldn't find a coild with such a high ...
2
votes
4answers
870 views
what is the temperature equilibrium for a copper conductor conducting 4000 Amps
I have a copper conductor with a total resistance of 1 miliohm and a passing current of 4000 Amps.
I want to know what the temperature equilibrium is for a conductor in the electrical grid (conductor ...
3
votes
1answer
171 views
High current plasma jet striking circuit
A little background: I'm a mechanical engineering graduate student with a focus in materials, so electrical engineering is not my core background. I'm conducting research on plasma surface treatment ...
0
votes
1answer
602 views
How can you calculate a railgun's exit velocity?
Having a cylindrical iron container with wall thickness of 20 cm, and a total weight of 50 tons when filled with its cargo, how would you be able to calculate its required voltage and current input in ...
